CVE-2026-15937Disclosure

LOWCVSS 5.3 · MEDIUM

Signal is active with 1 mentions in latest observed window

Immediate actions

Track advisory updates for patch or workaround availability

Recommended action window: Monitor and triage in normal cycle

NVD description

Improper certificate validation in Checkmk <2.5.0p10 allows a relay and a push agent that share the same UUID to reuse each other's mTLS certificate to authenticate against agent receiver endpoints in either direction, because the endpoints do not verify that the certificate was issued by their own root certificate.

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0.0/ 10 priority

Sources & remediation

Other references

https://checkmk.com/werk/19735

Weakness type (CWE)

CWE-295

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

NONE

Momentum

NONE

Threat summary

1 mentions across 1 observed day

What's happening

Technical details provided in 1 signal
Disclosure: 1 classified signal
1 total mentions across 1 day

Deep dive

Activity timeline1 mentions / 1d

Signal classification1 categories

Disclosure

1100.0%

Referenced assets1 URL

By indicator

https://www.cve.org/CVERecord?id=CVE-2026-15937

Full discourse1 post

CVE@CVEnew46d
Disclosure
CVE-2026-15937 Improper certificate validation in Checkmk <2.5.0p10 allows a relay and a push agent that share the same UUID to reuse each other's mTLS certificate to authenticate a… https://www.cve.org/CVERecord?id=CVE-2026-15937
Post summary
The CVE report states that improper certificate validation in Checkmk allows a relay and a push agent sharing the same UUID to reuse each other's mTLS certificates, potentially enabling an authentication bypass.
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